Vertical transfer suction press assembly



Nov. 16, 1954 E. D. BEACHLER 2,694,348

VERTICAL TRANSFER SUCTION PRESS ASSEMBLY Filed Sept. 27, 1950 hz E 1-1 in 2- In wnleaD. 3540a 5e United States Patent VERTICAL TRANSFER SUCTION PRESS ASSEMBLY Edward D. Beachler, Beloit, Wis, assignor to Beloit Iron Works, Beloit, Wis, a corporation of Wisconsin Application September 27, 1950, Serial No. 187,012

4 Claims. (Cl. 9249) The present invention relates to a vertical transfer suction press assembly for a paper making machine, and more particularly to a suction press assembly wherein a vertical nip double suction press is interposed between the presses of a press assembly to de-water a moist paper web While at the same time transferring the web from site press felt to another press felt of the press assem- In accordance with the principles of the present invention, there is provided a pick-up felt for transferring a moist paper web from a forming surface, such as a Fourdrinier wire, to a first suction press where the web is transferred to a first press felt. The web carried by the first press felt is then passed through the vertical nip of a double suction press defined by a pair of horizontally aligned suction rolls. The first press felt is trained about the suction box of one of the suction rolls While a second press felt is trained about a suction box of the other of the press rolls. The suction areas of the rolls are not opposed to each other but are immediately consecutively operable upon the moist web so that a web is first subjected to suction in the nip area of the double suction press, and also so that the web is transferred to the second press felt for passage therewith through the reverse press nip. After passage through the reverse press nip, an additional pressing action is obtained by the utilization of an additional suction roll disposed within the loop of the second press felt and in press nip relation with a dryer part of the machine, such as a Yankee dryer drum or the like.

It will thus be appreciated that the present invention provides a double suction press which serves a plurality of functions, namely, to aid in de-watering the web by both mechanical nip pressure and differential fluid pressure and also to transfer the web from one press felt to another within a press assembly.

It is, therefore, an important object of the present invention to provide a paper making machine press section which includes a vertical nip double suction press effective to both de-water a moist paper web trained therethrough and to transfer the web from one press felt to another within the assembly.

Another important object of the present invention is to provide a vertical nip double suction press including a pair of generally horizontally aligned suction press rolls having their suction areas consecutively effective to dewater a paper web passed therebetween and to transfer the web from one press felt to another.

It is a further important object of the present invention to provide a paper making machine press section including a first suction press, a vertical nip double suction press and a reverse press, the double suction press being effective to transfer a moist paper web passing through the press section from the suction press to the reverse press as well as being effective to exert mechanical nip pressure and differential fluid pressure upon the web.

Still another important object of the present invention is to provide a press section for a paper making machine including a suction press, a first press felt for conveying a moist paper web through the suction press, a vertical nip double suction press receiving the first press felt through the press nip thereof, a second press felt also trained through the nip of the double suction press and receiving the web from the first press felt at the double suction press nip and an additional suction press defined by a press roll positioned beyond the double suction press and in press nip relation with a drier part of the paper making machine.

.Other and further important objects of this invention will be apparent from the disclosures in the specification and the accompanying, drawings.

This invention (in a preferred form) is illustrated in the drawings and hereinafter more fully described.

Onthe drawings:

The single figure of the drawings is a schematic representation of a paper making machine vertical transfer suction press assembly of the present invention.

As shown on the. drawings:

In Figure 1, reference numeral 10 refers generally to a foraminous paper machine forming surface, such as a Fourdrinier wire trained about a suction couch roll 11 prfiviiied with a suction area 12 and about a wire turning r0 3.

A moist paper web W, previously formed on the wire 10 by the deposition of a pulp suspension thereon as is well known in the art, is removed from contact with the wire by utilization of a pick-up felt 14 guided by a plurality of guide rolls 15 into partial peripheral contact with a suction pick-up roll 16 disposed within the loop of the endless pick-up felt 14. The pick-up roll 16 is provided with a suction area 17 which acts through the pick-up felt. 14 upon the web W supported upon the wire 10 between the couch roll 11 and the turning roll 13. The suction pick-up roll transfers the web from the forming wire 10 to the pick-up felt for conveyance with the felt in a substantially horizontal path to a suction press nip 19 provided by an upper plain press roll 20 disposed within the loop of the pick-up felt 14 and by a lower suction press roll 21 provided with a suction area 22 at the nip 19.

The suction area 22 of the suction press roll 21 is lapped by a first press felt 23 trained by a plurality of guide rolls 24 through the nip 19 into partial peripheral contact with the suction roll 21 and into contact with the web W carried on the under surface of the pick-up felt 14. It will be seen that the web W is subjected to both mechanical nip pressure and differential fluid pressure at the nip 19, with the suction area 22 being effective to transfer the web W from the pick-up felt 14 to the first press felt 23. Following its passage through the nip 19, the web W is carried by the felt 23 in a substantially horizontal direction to a double suction vertical press nip 26. The nip 26 is defined by a first suction press roll 27 disposed within the loop of the endless first press felt 23'and having a suction area 28 lapped by the press felt 23 and the web W carried thereby. It will be noted that each of the suction press rolls 21 and 27 is provided with a conventional arcuate save-all pan 29 and 30 respectively.

The nip 26 is defined by cooperation of the suction press roll 27 with a second suction press roll 32 which is provided with a pair of adjacent suction areas, namely, a relatively high vacuum suction area 33 at the nip 26 and a lower vacuum suction area 34 peripherally displaced from the nip 26 and having the degree of vacuum therein controlled by means of a butterfly valve 35. A second press felt 37 is trained through the vertical nip 26 by means of a plurality of felt guide rolls 38, the felt 37 lapping each of the suction areas 33--34 of the second suction press roll 32. The suction area 33 of the roll 32 is effective to transfer the web W from the first press felt 23 to the second press felt 37 and the second suction area 34 serves to retain the web in contact with the felt 37 after transfer has been accomplished.

The second press felt 37 serves to carry the still moist web W to a reverse press nip 40 defined by an upper suction press roll 41 having a suction area 42 and a lower plain press roll 43. The reverse press nip 40 is, of course, so called because it is a reverse press with respect to the press defined by the rolls 19 and 21 in that it applies suction to the opposite or reverse side of the web to which suction is applied in the first press defined by the rolls 19 and 21'. The suction area 42 of the reverse press suction roll 41 is lapped by the felt 37 to retain the web W on the under surface of the felt 37 even after passage of the web through the nip 4%. The roll 43 is partially lapped by an additional press felt 44, the felt being guided about the roll 43 and through the nip 40 by means of guide rolls 45. An additional suction press roll 47 is disposed within the loop of the second press felt 37, the roll 47 having a suction area 48 lapped by the press felt 37, with the degree of vacuum within the suction area 48 being controlled by means of a butterfly valve 49. It will be noted that each of the rolls 32, 41, 43 and 47 is provided with a conventional arcuate save-all pan 50-53 respectively, to prevent the centrifugal flinging of moisture from the web or felt against a portion of the felt or web.

The roll 47 is in press nip relation with a dryer part of the paper making machine such as a Yankee dryer drum 54, with the degree of vacuum within the suction area 48 being insufficient to cause retention of the moist web upon the felt 37. Thus, the web is transferred to the periphery of the Yankee dryer drum 54 from which the web is removed by suitable means, as by a doctor blade 55.

The operation of press assembly of the present invention will be readily appreciated from the foregoing description. The moist web W is removed from the wire by means of a pick-up roll 16 exerting suction upon the web through the pick-up felt 14. The pick-up felt 14 conveys the web W to the suction press nip 19 where the suction area 22 of the roll 21 causes transfer of the Web W to the first press felt 23. Following passage of the web W through the nip 19, the press felt introduces the web to the vertical double suction press nip 26. It will be seen that the suction area 28 of the roll 27 creates a differential fluid pressure exerted upon the web W in ad vance of the nip 26 while the suction area 33 also exerts such a diflerential pressure. However, the suction area 33 is also effective to transfer the web W from the press felt 23 to the second press felt 37, this transfer taking place at the mechanical pressure nip of the rolls 27 and 32. Retention of the web W upon the press felt 37 is insured by the provision of the reduced vacuum suction area 34 of the roll 32. Following passage of the web W through the nip 40, the web is next subjected to both mechanical and fluid pressures at the reverse press nip 40. The web W is retained upon the second press felt 37 during passage of the web through the nip 40 by means of the suction area 42, with the web being transferred to the Yankee dryer drum 54, or similar dryer part, at the nip defined by the dryer part with the additional suction roll 47.

Thus, it will be appreciated that the present invention provides an extremely simple reverse press wherein each side of a web is subjected to vacuum a plurality of times, wherein the web is supported by a felt carrier during its entire passage through the press section, and wherein transfer of the web at each instance during its path of travel is accomplished under the influence of suction. It will be noted that the suction areas of the rolls 27 and 32 are peripherally offset in order to prevent concurrent subjection of both sides of the web to suction and the consequent neutralization of effective dif' ferential fluid pressure conditions upon the web. In this manner, differential fluid pressure drying of the web is enhanced while at the same time transfer of the web between a pair of press felts is effected.

It will, of course, be understood that various details of construction may be varied through a wide range without departing from the principles of this invention,

and it is, therefore, not the purpose to limit the patent granted hereon otherwise than necessitated by the scope of the appended claims.

I claim as my invention:

1. A suction press assembly for a paper making machine comprising a suction press, a reverse suction press, a vertical nip two-suction roll press interposed between said suction press and said reverse suction press, a first press felt trained through the nip of the suction press and the nip of the two-suction roll press for conveying a moist paper web therebetween, a second press felt trained through the nip of the two-suction roll press and through the nip of the reverse suction press for receiving the moist paper web from the first press felt and conveying the web to the reverse press nip, and an additional suction press nip defined by a third suction press roll lapped by said second press felt and the web carried thereby and a dryer drum in suction press nip defining relation with said third suction roll for receiving the paper web from the second press felt.

2. A suction press assembly for a paper making machine comprising a pair of press rolls defining a horizontal felt covered press nip, one of said rolls having a pick-up felt lapped thereabout and the other of said rolls being a suction roll having a first press felt lapped thereabout; a pair of suction press rolls defining a vertical felt covered press nip, one of said pair of suction rolls having said first press felt lapped thereabout and the other of said pair of suction rolls having a second press felt lapped thereabout, the suction areas of said suction rolls of said vertical suction press being consecutively operable upon the web to transfer the same from said first press felt to said second press felt; a second pair of press rolls defining a horizontal felt covered press nip, one of said second pair of rolls being a suction roll having the suction area thereof covered by said second press felt and the other of said second pair of rolls being lapped by a third press felt; and another pair of press rolls defining a press nip, one of said last mentioned pair of rolls being a yankee drier drum and the other of said rolls being a suction roll whose suction area is adjacent the press nip and is lapped by said second press felt.

3. A press assembly for a paper making machine comprising a first suction press, a pick-up felt for conveying a moist paper web from a paper machine forming roll to said first suction press and trained through the nip thereof, a first press felt trained through the nip of said first suction press for receiving the paper web from said pick-up felt, a second suction press having a pair of vertical nipdefining suction rolls receiving said first press felt therethrough, said first suction press and said pick-up and first press felts being positioned so as to convey the paper web from the forming wire through the first suction press and to the second suction press without an open draw and in substantially a horizontal plane, a second press felt also trained through the nip of said second suction press for receiving the moist paper web from the first press felt, a third suction press that is a reverse suction press having a suction roll within the loop of said second press felt, and a fourth suction press having a third suction press roll lapped by said second press felt and web carried thereby and a yankee drier drum in suction press defining relation with said third suction roll for receiving the paper web from the second press felt, said second press felt and sa1d reverse suction press being so positioned that the web is conveyed from said second suction press through sald reverse suction press and to the suction press roll cooperating with the yankee drier drum without an open draw and in substantially a horizontal plane.

4. A suction press assembly for a paper making machine compr1s1ng a pair of press rolls defining a horizontal felt covered press nip, one of said rolls having a pick-up felt lapped thereabout and the other of said rolls being a suction roll having a first press felt lapped thereabout; a pair of suction press rolls defining a vertical felt covered press nip; one of said pair of suction rolls havmg said first press felt lapped thereabout and the other of said pair of suction rolls having a second press felt lapped thereabout, the suction areas of said suction rolls of sald vertical suction press being consecutively operable upon the web to transfer the same from said first press felt to sa1d second press felt; and a second pair of press rolls defining a horizontal felt covered press nip, one of saldsecond pair of rolls being a suction roll having the suction area thereof covered by said second press felt and the other of said second pair of rolls being lapped by a th1rd press felt.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date Re. 16,100 Tompkins June 23, 1925 1,163,253 Millspaugh Dec. 7 1915 1,701,226 Collins Feb. 5 1929 1,981,049 Kellett Nov. 20 1934 2,005,929 Berry June 25' 1935 2,186,171 Millspaugh Jan. 9 1940 2,204,426 Berry June 11, 1940 2,209,757 Berry July 30, 1940 2,386,584 Berry Oct. 9 1945 2,415,350 Hornbostel 6! al. Feb. 4, 1947 FOREIGN PATENTS Number Countr 431,408 Germany .lune a t l924 

